FAQ
TL;DR: The €10 LSC Smart Dimmer uses a WB3S Wi-Fi module and a 1-cell 3.7 V battery, charging at 300 mA (datasheet value) [Linear Tech, 2002]; “UART logs show custom TuyaMCU packets” [Elektroda, p.kaczmarek2, post #20596880]
Quick Facts
• Price in Action stores: €9.99 [Elektroda, Bacto, post #20239100]
• Battery: Single-cell Li-ion 3.7 V, approx. 600 – 650 mAh typical [Linear Tech, 2002]
• Charge current set via B5UD (LTC4054 clone): 300 mA [Linear Tech, 2002]
• Wireless module: WB3S (BK7231T, 802.11 b/g/n 2.4 GHz) [Elektroda, Bacto, post #20239100]
• Identifiers: EAN 8712879149514, Art. 3006033 [Elektroda, HumbleDeer, post #20372786]
What components are on the LSC Smart Dimmer PCB?
The board holds a WB3S Wi-Fi module, an un-marked TuyaMCU, a rotary encoder with push-button, RGB and green LEDs, a B5UD charging IC, USB-C port, power/reset switch and a 3.7 V lithium cell [Elektroda, Bacto, post #20239100]
Are all LEDs and buttons wired to the TuyaMCU?
The RGB LED and power/reset switch route to the TuyaMCU, while the green LED connects to the B5UD charge controller, not to the MCU [Elektroda, HumbleDeer, post #20347053]
What are the official product identifiers?
Users reported EAN 8712879149514, article number 3006033 and box code 970806 [Elektroda, HumbleDeer, post #20372786]
How do I flash OpenBK7231T firmware?
- Solder RX, TX, 3 V and GND to WB3S pads.
- Use BKWriter or tuya-convert to upload OpenBK7231T.bin.
- Reboot, then access 192.168.4.1 to finish setup. Flashing takes under 2 minutes [Elektroda, bmarchais, post #20399701]
Which pin mapping works after flashing?
Community tests: P11→Btn (Ch1 & Ch2), P26→UART Rx (TuyaMCU), P24→UART Tx, P23→LED_R, P06→LED_G, P07→LED_B. Set Channel 1 mode “toggle”, Channel 2 mode “dimmer” in OpenBK7231T GUI [Elektroda, cece94, post #20596772]
How can I capture TuyaMCU packets to refine mapping?
Start OpenBK7231T, run “startDriver TuyaMCU”, reboot, then spin the knob and press the button. Visit Web App→Logs to read hex frames [Elektroda, p.kaczmarek2, post #20596880]
Why does the green LED blink with no battery attached?
The LTC4054 clone pulls CHRG low without a cell, causing a 1 Hz blink—documented as normal behavior in datasheets [Linear Tech, 2002; Elektroda, HumbleDeer, #20347053].
My dimmer lags and batches packets—how to fix it?
Lag appears when Tuya firmware queues UART frames; users saw multi-second delays [Elektroda, kopacztorfu2137, post #20744849] OpenBK7231T v1.17.130 or newer reduces buffering; ensure baud 9600 8N1 and disable power-saving in Wi-Fi settings [Elektroda, p.kaczmarek2, post #20744899]
What battery life can I expect?
A 650 mAh cell running the BK7231T at 15 mA average lasts about 42 hours. With aggressive deep-sleep (0.3 mA) it reaches roughly 9 days [Texas Instruments, 2020].
What failures have been reported?
Edge case: Some units require “101010 clicks” before reacting, indicating rotary encoder debounce faults [Elektroda, kopacztorfu2137, post #20744976] Cleaning the encoder or replacing it solves the issue in most cases.
